U.S. patent number 10,928,713 [Application Number 16/282,074] was granted by the patent office on 2021-02-23 for display device, display method and game machine.
This patent grant is currently assigned to Omron Corporation. The grantee listed for this patent is Omron Corporation. Invention is credited to Junya Fujita, Shohei Hisaki, Shogo Ikeda, Jun Kishimoto, Masanori Mori, Mitsuru Okuda.
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United States Patent |
10,928,713 |
Okuda , et al. |
February 23, 2021 |
Display device, display method and game machine
Abstract
A display device has a projector having a light guide plate that
guides light incident from an end portion and deflects the light
guided to emit the light from a projection surface facing a viewer
in a first direction, the projector being configured to emit light
from the projection surface to project an image in a space viewable
by the viewer, and a rotator configured to rotate the projector
around the first direction. When a first end on the projection
surface is located at a first position being an upper side in a
second direction orthogonal to the first direction, the image is
viewed as a stereoscopic image by the viewer. When the rotator
rotates the projector and the first end is located at a second
position different from the first position, the image is viewed as
a planar image by the viewer.
Inventors: |
Okuda; Mitsuru (Kyoto,
JP), Fujita; Junya (Kyoto, JP), Kishimoto;
Jun (Kyoto, JP), Mori; Masanori (Kyoto,
JP), Hisaki; Shohei (Kyoto, JP), Ikeda;
Shogo (Kyoto, JP) |
Applicant: |
Name |
City |
State |
Country |
Type |
Omron Corporation |
Kyoto |
N/A |
JP |
|
|
Assignee: |
Omron Corporation (Kyoto,
JP)
|
Family
ID: |
67905511 |
Appl.
No.: |
16/282,074 |
Filed: |
February 21, 2019 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20190285971 A1 |
Sep 19, 2019 |
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Foreign Application Priority Data
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|
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Mar 19, 2018 [JP] |
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JP2018-050671 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B
6/0031 (20130101); H04N 13/363 (20180501); H04N
13/356 (20180501); G02B 6/006 (20130101); H04N
9/315 (20130101); G03B 21/001 (20130101); G02B
6/0036 (20130101); G03B 21/142 (20130101); G03B
35/00 (20130101) |
Current International
Class: |
F21V
8/00 (20060101); H04N 13/363 (20180101); G03B
21/14 (20060101); H04N 9/31 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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101038421 |
|
Sep 2007 |
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CN |
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2001208968 |
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Aug 2001 |
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JP |
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2009-216933 |
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Sep 2009 |
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JP |
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2015-510710 |
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Apr 2015 |
|
JP |
|
Other References
Search Report issued in Chinese Application No. 201910113910.3;
dated Jul. 30, 2020 (2 pages). cited by applicant .
Office Action issued in Chinese Application No. 201910113910.3;
dated Aug. 5 2020 (14 pages). cited by applicant.
|
Primary Examiner: Iacoletti; Michelle M
Assistant Examiner: Cruz; Magda
Attorney, Agent or Firm: Osha Bergman Watanabe & Burton
LLP
Claims
The invention claimed is:
1. A display device comprising: a projector having a light guide
plate that guides light incident from an end portion and deflects
the light guided to emit the light from a projection surface facing
a viewer in a first direction, the projector being configured to
emit light from the projection surface to project an image in a
space viewable by the viewer; a rotator configured to rotate the
projector around the first direction; and a plurality of light
sources comprising a first light source and a second light source,
wherein, when a first end on the projection surface is located at a
first position being an upper side in a second direction orthogonal
to the first direction, the image is viewed as a stereoscopic image
by the viewer, wherein, when the rotator rotates the projector and
the first end is located at a second position different from the
first position, the image is viewed as a planar image by the
viewer, wherein the first light source extinguishes light when the
rotator rotates the projector, and the first light source emits
light when the first end of the projector is located at the second
position based on a rotation instruction of the rotator, and
wherein when the first end is located at the second position, the
second light source emits light, the second light source being
different from the first light source that emits light when the
first end is located at the first position.
2. The display device according to claim 1, wherein the second
position is an upper side in a third direction orthogonal to the
first direction and the second direction.
3. The display device according to claim 2, wherein the rotator is
connected to a back surface of the projection surface of the
projector to rotate the projector.
4. The display device according to claim 2, wherein the rotator is
connected to a side end portion of the projection surface of the
projector to rotate the projector.
5. The display device according to claim 2, wherein the rotator
rotates the projector at a timing not based on viewer's
instruction.
6. The display device according to claim 1, wherein the rotator is
connected to a back surface of the projection surface of the
projector to rotate the projector.
7. The display device according to claim 6, wherein the rotator
rotates the projector at a timing not based on viewer's
instruction.
8. The display device according to claim 1, wherein the rotator is
connected to a side end portion of the projection surface of the
projector to rotate the projector.
9. The display device according to claim 8, wherein the rotator
rotates the projector at a timing not based on viewer's
instruction.
10. The display device according to claim 1, wherein the first
light source moves with rotation of the projector.
11. The display device according to claim 10, wherein the rotator
rotates the projector at a timing not based on viewer's
instruction.
12. The display device according to claim 1, wherein the rotator
rotates the projector at a timing not based on viewer's
instruction.
13. A game machine comprising the display device according to claim
1.
14. A display method in a display device including: a projector
having a light guide plate that guides light incident from an end
portion and deflects the light guided to emit the light from a
projection surface facing a viewer in a first direction, the
projector being configured to emit light from the projection
surface to project an image in a space viewable by the viewer; a
rotator configured to rotate the projector around the first
direction; and a plurality of light sources comprising a first
light source and a second light source, wherein the display method
comprises: a stereoscopic image viewing step in which the rotator
rotates the projector such that a first end on the projection
surface is located at a first position being an upper side in a
second direction orthogonal to the first direction, to cause the
viewer to view the image as a stereoscopic image; and a planar
image viewing step in which the rotator rotates the projector such
that the first end is located at a second position different from
the first position, to cause the viewer to view the image as a
planar image, wherein the first light source extinguishes light
when the rotator rotates the projector, and the first light source
emits light when the first end of the projector is located at the
second position based on a rotation instruction of the rotator, and
wherein when the first end is located at the second position, the
second light source emits light, the second light source being
different from the first light source that emits light when the
first end is located at the first position.
Description
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority to Japanese Patent Application No.
2018-050671 filed with the Japan Patent Office on Mar. 19, 2018,
the entire contents of which are incorporated herein by
reference.
BACKGROUND
Field
The present invention relates to a display device, a display
method, and a game machine for displaying a stereoscopic image.
Related Art
Conventionally, a display device enabling a viewer to recognize a
stereoscopic image, namely a three-dimensional image, has been
proposed. In recent years, in order to make a stereoscopic image
viewable without spectacles, there has also been provided a display
device, such as a liquid crystal display device, including a
parallax generating optical element for generating parallax, such
as a lenticular lens. In this display device, an image is displayed
in a state where parallax has been generated for the right eye and
for the left eye by light transmitted through the parallax
generating optical element, and the viewer recognizes the image as
a stereoscopic image.
There are also cases where, depending on an image, it may be better
to see the image as a planar image, namely a two-dimensional image,
and a device has thus been provided which is capable of selectively
using planar image display and stereoscopic image display according
to the viewer's intention.
For example, in a display device described in Japanese Translation
of PCT International Application Publication No. 2015-510710, the
front surface of the device is the surface for displaying a
stereoscopic image, and the back surface thereof, namely the
180-degree reversed surface, is the surface for displaying a planar
image. The viewer can turn the device upside down according to the
application and the like, to see the three-dimensional image and
the two-dimensional image.
Further, in a display device described in Japanese Unexamined
Patent Application Publication No. 2009-216933, a parallax
generating optical element such as a lenticular lens can be
detachably disposed on an organic EL screen that displays an image.
When a viewer is to see a three-dimensional image, parallax
generating optical element is provided on the organic EL screen.
When the viewer is to see a two-dimensional image, the parallax
generating optical element is removed from the organic EL screen
and the viewer directly sees the organic EL screen.
Meanwhile, in the conventional device capable of selectively using
a three-dimensional image and a two-dimensional image, each of a
screen for a three-dimensional image and a screen for a
two-dimensional image is required as in the device of Japanese
Translation of PCT International Application Publication No.
2015-510710, or a parallax generating optical element is required
on an image display screen as in the device of Japanese Unexamined
Patent Application Publication No. 2009-216933. That is, for seeing
the same image stereoscopically, an individual screen is required
or an accessory such as a lens is required, and hence the
conventional device has not been able to realize both stereoscopic
viewing and plan viewing without the accessory on one display
screen.
In addition, the proper selection between three-dimensional image
and the two-dimensional image has been made by the viewer's
physical operation based on the viewer's intention, and has not
been automatically made.
SUMMARY
There is a visual effect that a three-dimensional image appears to
jump out in front of the eyes at the moment when the viewer looks
at the image, but when the viewer sees the same image for a certain
amount of time, the freshness of what appears stereoscopically
disappears and the visual effect diminishes.
One or more embodiments of the present invention provides a display
device capable of automatically selecting and displaying a
stereoscopic image (three-dimensional image) and a planar image
(two-dimensional image) on one display screen without the need for
an accessory such as a lens.
One or more embodiments of the present invention is directed to a
display device including: a projector having a light guide plate
that guides light incident from an end portion and deflects the
light guided to emit the light from a projection surface facing a
viewer in a first direction, the projector being configured to emit
light from the projection surface to project an image in a space
viewable by the viewer; and a rotator configured to rotate the
projector around the first direction, in which when a first end on
the projection surface is located at a first position being an
upper side in a second direction orthogonal to the first direction,
the image is viewed as a stereoscopic image by the viewer, and when
the rotator rotates the projector and the first end is located at a
second position different from the first position, the image is
viewed as a planar image by the viewer.
Further, the display device may be a display device in which the
second position is an upper side in a third direction orthogonal to
the first direction and the second direction.
Further, the display device may be a display device in which the
rotator is connected to a back surface of the projection surface of
the projector to rotate the projector.
Further, the display device may be a display device in which the
rotator is connected to a side end portion of the projection
surface of the projector to rotate the projector.
Further, the display device may include a light source in which the
light source extinguishes light when the rotator rotates the
projector, and the light source emits light when the first end of
the projector is located at the second position.
Further, the display device may be a display device in which the
light source moves with rotation of the projector.
Further, the display device may be a display device in which a
plurality of the light sources are provided, and when the first end
is located at the second position, a light source emits light, the
light source being different from the light source that emits light
when the first end is located at the first position.
Further, the display device may be a display device in which the
rotator may rotate the projector at a timing not based on viewer's
intention.
Further, a game machine according to one or more embodiments of the
present invention includes the display device having one of the
configurations described above.
A display method according to one or more embodiments of the
present invention in a display device including a projector having
a light guide plate that guides light incident from an end portion
and deflects the light guided to emit the light from a projection
surface facing a viewer in a first direction, the projector being
configured to emit light from the projection surface to project an
image in a space viewable by the viewer and a rotator configured to
rotate the projector around the first direction, the display method
includes: a stereoscopic image viewing step in which the rotator
rotates the projector such that a first end on the projection
surface is located at a first position being an upper side in a
second direction orthogonal to the first direction, to cause the
viewer to view the image as a stereoscopic image; and a planar
image viewing step in which the rotator rotates the projector such
that the first end is located at a second position different from
the first position, to cause the viewer to view the image as a
planar image.
In one or more embodiments of the present invention, it is possible
to provide a display device capable of automatically selecting and
displaying a stereoscopic image (three-dimensional image) and a
planar image (two-dimensional image) on one display screen without
the need for an accessory such as a lens.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1A and 1B are schematic perspective views each illustrating a
display device 1 according to a first embodiment, where FIG. 1A
illustrates a state in which an image is viewed as a stereoscopic
image, and FIG. 1B illustrates a state where an image is viewed as
a planar image;
FIG. 2 is a schematic side view of FIG. 1A;
FIG. 3 is a schematic front view of the display device 1
illustrated in FIG. 1A as seen from the direction of arrow a;
FIG. 4 is a schematic perspective view illustrating a mechanism for
displaying an image by a light guide plate 11 in the first
embodiment;
FIGS. 5A to 5C are schematic views each illustrating a display
device 1 for displaying an image different from the image
illustrated in FIG. 1, where FIG. 5A is a schematic front view
illustrating a state in which an image is viewed as a stereoscopic
image, FIG. 1B is a schematic perspective view illustrating a state
in which an image is viewed as a stereoscopic image, and FIG. 5C is
a schematic perspective view illustrating a state in which an image
is viewed as a planar image;
FIGS. 6A to 6C are schematic views each illustrating the shape of
the light guide plate 11, where FIG. 6A is a top view of a light
guide plate 11 having a square shape, FIG. 6B is a top view of a
light guide plate 11 having a circular shape, and FIG. 6C is a
perspective view of a light guide plate 11 having a curved
surface:
FIG. 7 is a schematic top view illustrating a display device of a
second embodiment;
FIG. 8 is a schematic top view illustrating a display device of a
third embodiment;
FIG. 9 is a schematic top view illustrating a display device of a
fourth embodiment;
FIGS. 10A to 10C are schematic views each illustrating the
relationship between a light source 20 and a light guide plate 11
of a fifth embodiment, where FIG. 10A is a schematic front view
illustrating a state in which an image is viewed as a stereoscopic
image, FIG. 10B is a schematic perspective view illustrating a
state in which an image is viewed as a stereoscopic image, and FIG.
10C is a schematic perspective view illustrating a state in which
an image is viewed as a planar image;
FIGS. 11A to 11C are schematic views each illustrating a display
device 1 according to a sixth embodiment, where FIG. 11A is a
schematic perspective view of the display device 1, FIG. 11B is a
sectional view obtained by cutting out FIG. 11A along line XIb-XIb,
and FIG. 11C is a schematic view of a base plate 31a as seen from
above; and
FIGS. 12A to 12C are schematic views each illustrating a display
device 1 according to a seventh embodiment, where FIG. 12A is a
schematic perspective view of the display device 1, FIG. 12B is a
sectional view obtained by cutting out FIG. 12A along line
XIIb-XIIb, and FIG. 12C is a schematic view of a base 37 as seen
from above.
DETAILED DESCRIPTION
First Embodiment
Hereinafter, embodiments of the present invention will be described
in detail with reference to the drawings. Identical or equivalent
constituent elements, members, and processes illustrated in the
drawings are denoted by the same reference numerals, and redundant
descriptions will be omitted as appropriate. In embodiments of the
invention, numerous specific details are set forth in order to
provide a more thorough understanding of the invention. However, it
will be apparent to one of ordinary skill in the art that the
invention may be practiced without these specific details. In other
instances, well-known features have not been described in detail to
avoid obscuring the invention.
A display device according to one or more embodiments of the
present invention may be provided not only as a single unit that
displays an image to a viewer but also as a member provided in a
game machine, the member exerting a visually appealing presentation
effect. Alternatively, the display device may be provided as one of
members provided in various kinds of toys and learning devices for
infants and the like, the members exerting visually appealing
presentation effects. In addition, the display device may be
incorporated in various apparatuses as a member that exerts a
visually appealing presentation effect or a member that makes an
image viewed as a stereoscopic image.
FIGS. 1A and 1B are schematic perspective views each illustrating a
display device 1 according to a first embodiment, where FIG. 1A
illustrates a state in which an image is viewed as a stereoscopic
image, and FIG. 1B illustrates a state where an image is viewed as
a planar image.
FIG. 2 is a side view of the display device 1 illustrated in FIG.
1A.
FIG. 3 is a schematic front view of the display device 1
illustrated in FIG. 1A as seen from a direction of arrow a, and an
image to be displayed is not illustrated for the sake of
convenience.
The display device 1 of the embodiment includes a projector 10, a
light source 20 that emits light to the projector 10, a rotator 30
that is connected to the projector 10 and rotates the projector 10,
and a controller, not illustrated, that controls the driving of the
light source 20, the rotator 30, and the like. In the display
device 1, when the projector 10 is at a first position illustrated
in FIG. 1A, namely, the light source 20 is on an upper side in a Y
direction, a viewer 40 views an image as a stereoscopic image. On
the other hand, when the projector 10 is at a second position
illustrated in FIG. 1B, namely, the light source 20 is in an X
direction, the viewer 40 views the image as a planar image.
Hereinafter, the position of the projector 10 (light guide plate
11) where an image is viewed as a stereoscopic image by the viewer
40 is referred to as a first position, and the position rotated 90
degrees from the first position is referred to as a second
position. In one or more embodiments of the present invention, the
first position is a position where the image is viewed as a
stereoscopic image by the viewer 40, and the second position is a
position which is not limited to the position rotated 90 degrees,
but includes other positions as long as being positions where the
image is viewed as a planar image by the viewer 40.
In one or more of the above embodiments, the projector 10 is the
light guide plate 11, but the present invention is not limited
thereto. The projector 10 internally has a projector that has a
light guide plate (light guide unit) 11 and changes an optical path
of light from the light source 20 on the inside of the light guide
plate 11 to project an image from the projection surface of the
projector 10. For example, the projector 10 includes a projector in
which a light guide path for guiding light from the light source 20
is included in the light guide plate 11.
The light guide plate 11 is a flat plate formed of a transparent
resin material having a relatively high refractive index. A
material for forming the light guide plate 11 may, for example, be
polycarbonate resin (PC), polymethyl methacrylate resin (PMMA),
glass, or the like. In this manner, since the light guide plate 11
is transparent, almost all the light from a back surface 13 passes
therethrough, and a matter on the back surface 13 of the light
guide plate 11 can also be viewed. Therefore, it is also possible
to dispose a liquid crystal display device or the like on the back
surface 13 side and superimpose and display the image of the liquid
crystal display device and the image from the light guide plate
11.
The light guide plate 11 is a quadrangular flat plate made up of a
main surface (projection surface) 12 that faces the viewer 40 and
emits light from the light source 20, the back surface 13 that is a
back surface of the main surface 12 and is connected to the rotator
30, a side surface 14 located between the main surface 12 and the
back surface 13. As illustrated in FIG. 3, as for the side surface
14, namely, the side ends to be four sides of the main surface 12,
the side end to which the light source 20 is joined is a first end
14a, and the other sides are a second end 14b, a third end 14c, and
a fourth end 14d sequentially clockwise from the first end 14a.
The light source 20 includes a light emitting unit (not
illustrated) and its lens, expands light emitted from the light
emitting unit so as to have a planar shape in a direction parallel
to the main surface 12 with the lens, and makes the light incident
from the first end 14a of the light guide plate 11. The structure
of the light source 20 is not only the structure provided with the
light emitting unit and the lens, but may be any known structure as
long as being a structure that guides light to the light guide
plate 11. The light guide plate 11 internally changes the optical
path of the light incident from the first end 14a, and emits the
light from the main surface 12 in a form of light convergence in a
predetermined direction to form an image. The light emitting unit
can emit and extinguish light based on a control signal of the
controller.
A known mechanism described in Japanese Patent No. 5861797, which
is hereby incorporated by reference in its entirety, is used as a
mechanism of image display in the embodiment. That is, as
illustrated in FIG. 4, a plurality of light convergence portions
121 (121a, 121b) made of a plurality of reflective surfaces (prims
surfaces) are formed in advance on the main surface 12 of the light
guide plate 11 according to an image to be displayed. The light
incident from the light source is converged to a predetermined
fixed point 122 (122a, 122b) by the light convergence portion 121,
and a stereoscopic image is projected onto the space by the
converged light. The light convergence portion 121 in the
embodiment is formed by continuously arranging a plurality of
reflective surfaces along a straight line parallel to the X axis.
When the light guide plate 11 is at the first position, the viewer
40 is caused to view the image made up of a plurality of fixed
points 122 as a stereoscopic image.
The method of displaying an image according to one or more
embodiments of the present invention is not limited to a known
method described in Japanese Patent No. 5861797, but may be a known
stereoscopic image projecting method such as a method of projecting
an image for the right eye and an image for the left eye to display
a stereoscopic image by parallax. However, the projector 10
according to one or more embodiments of the present invention is to
project a stereoscopic image only with the projector 10, and not to
provide an accessory such as a lenticular lens in front of the main
surface (projection surface) 12 to cause the viewer to see a
stereoscopic image of the projection surface 12.
As illustrated in FIG. 2, the rotator 30 includes a base plate 31,
a shaft 32, and a rotation mechanism 33 such as a motor, and the
base plate 31 is joined to the center of the back surface 13 of the
light guide plate 11. When the rotation mechanism 33 is driven, its
driving force rotates the shaft 32 and the base plate 31. By the
driving of the rotator 30, the light guide plate 11 rotates around
a shaft A as a rotating shaft. Although the motor has been
exemplified as the rotation mechanism 33 in the embodiment, the
present invention is not limited thereto, and a mechanism with any
structure may be used as long as being a mechanism to rotate the
shaft 32. As illustrated in FIG. 2, the shaft A extends in a first
direction that is a direction in which the viewer 40 and the main
surface (projection surface) 12 of the light guide plate 11 face
each other. The first direction is parallel to a Z direction. When
the light guide plate 11 is at the first position with reference to
the first direction, the light source 20 is located on an upper
side in the second direction orthogonal to the first direction.
Returning to FIGS. 1A-1B, a display method of a stereoscopic image
and a planar image will be described specifically. In a case where
a stereoscopic image is to be viewed by the viewer 40 from the
projector 10, when light is emitted from the light source 20 while
the light guide plate 11 is located at the first position where the
light source 20 illustrated in FIG. 1A is located on the upper side
in the Y direction, namely, on the upper side in the second
direction, a stereoscopic image is formed between the main surface
12 and the viewer 40 or in a space behind the main surface 12 by
the known stereoscopic image display mechanism described above. The
viewer 40 thus recognizes a stereoscopic image "A" as illustrated
in FIG. 1A.
Next, in a case where a planar image is to be viewed by the viewer
40, the light guide plate 11 is rotated 90 degrees clockwise (a
direction of arrow B) by the rotator 30, and as illustrated in FIG.
1B, the light guide plate 11 is located at the second position, on
the right of which the light source 20 is located, as seen from the
viewer 40. That is, the light source 20 is located on an upper side
in a third direction orthogonal to the first direction and also
orthogonal to the second direction. In this state, when light is
emitted from the light source 20 to the light guide plate 11, the
image "A" is recognized by the viewer 40 as a planar image in the
state of being rotated 90 degrees clockwise.
The rotation direction of the light guide plate 11 is not limited
to clockwise but may be counterclockwise. In this case, as seen
from the viewer 40, the light source 20 is located on the left
side. Therefore, the third direction may be a direction extending
from the left to the right when viewed from the viewer 40 (in the
clockwise direction) or a direction extending from the right to the
left (in the counterclockwise direction).
As described above, the image according to the embodiment is
displayed in such a manner that, when the light guide plate 11 is
at the first position, the light convergence portion 121, formed by
continuously arranging a plurality of reflective surfaces along a
straight line parallel to the X axis, converts the light to a
specific position. Since the arrangement of the right eye and the
left eye of the viewer 40 is also located in the X direction, in
the positional relationship in which the light guide plate 11 is at
the first position, the arrangement direction of the reflective
surfaces of the light convergence portion 121 is substantially
parallel to the arrangement direction of the right eye and the left
eye of the viewer 40. Therefore, when the viewer 40 sees the image
with this positional relationship, the image is viewed as a
stereoscopic image. On the other hand, when the light guide plate
11 is rotated so as to be at the second position, the reflective
surfaces of the light convergence portion 121 are arranged in the Y
direction. Since the eye position of the viewer 40 is the same as
that in FIG. 1A, the arrangement direction of the right eye and
left eye and the arrangement direction of the reflective surfaces
of the light convergence portion 121 are substantially orthogonal.
When the viewer sees the image with this positional relationship,
the same image is viewed as a planar image.
As thus described, in one or more embodiments of the present
invention, the same view is shown to the viewer 40 stereoscopically
or planarly to the viewer by using the principle that varying the
orientation of the light guide plate 11 makes the same image seen
as a stereoscopic image or seen as a planar image. For example, in
the embodiment, during rotation of the light guide plate 11, the
light source 20 is turned off to bring the display into a dark
state. Then, when the light guide plate 11 is located at the second
position, the light source 20 is turned on again to display an
image on the viewer 40. In this manner, the projector 10 is rotated
at the timing not intended by the viewer 40 to control the lighting
of the light source 20, whereby, when the display in front of the
eyes becomes dark and then becomes bright again, the viewer 40 sees
a stereoscopic image, having appeared to rise to the viewer so far,
as a planar image, and the viewer 40 is thus given an unexpected
surprise.
When the light guide plate 11 is further rotated 90 degrees
clockwise from the position of FIG. 1B, the light source 20 comes
into the state of being located on a lower side in the Y direction.
In this case, the viewer 40 views a stereoscopic image in which "A"
is reversed. When the light guide plate 11 is further rotated 90
degrees clockwise, the light source 20 comes into the state of
being located on the left as seen from the viewer 40. In this case,
the viewer 40 views "A" as a planar image rotated 90 degrees to the
left.
By repetition of the rotation in this manner, when the arrangement
of the reflective surfaces of the light convergence portion 121 is
parallel to the X direction, the image is seen as a stereoscopic
image, and when the arrangement of the reflective surfaces is not
parallel to the X direction, the image is seen as a planar image.
Therefore, a stereoscopic image and a planar image can be caused to
appear alternately, and in combination of light emission and light
extinction of the light source 20, it is possible to give the
viewer 40 a presentation effect of an image rising or retracting
the image. In particular, when the display device of one or more
embodiments of the present invention is used in a game machine or
the like, by the presentation of combining showing the same image
as a stereoscopic image and showing it as a planar image at the
time of obtaining a score or the like, it is possible to give the
viewer 40 fresh visual effects. That is, instead of switching
between a stereoscopic image and a planar image in accordance with
an instruction from the viewer, the display of the image is
switched at a timing not based on the viewer's intention, so that
the presentation of combining the stereoscopic display and the
planar display for the same image can be performed.
The projector 10 of the embodiment can project a stereoscopic image
without using an accessory such as a lenticular lens, and can
provide in a switchable manner a stereoscopic image and a planar
image to the viewer 40 only with a simple configuration to rotate
the projector 10. Further, since a stereoscopic image and a planar
image can be displayed on the same screen, it is not necessary to
provide a plurality of screens for switching between a stereoscopic
image and a planar image. In this manner, a stereoscopic image and
a planar image can be viewed with a simple configuration. In
addition, since the viewer is caused to view the image without
interruption due to mounting or dismounting of the accessory or the
like, it is possible to display an image that moves from the
switching of a stereoscopic display and a planar display, and
provide a fresh presentation effect to the viewer.
Further, the rotation of the projector 10 by the rotator 30 may be
performed in accordance with an instruction from the viewer 40.
That is, when an instruction signal is input into the controller by
the viewer 40 pressing a selection button (not illustrated) for
selecting a stereoscopic image, a planar image, the controller
outputs a rotation instruction to the rotator 30 in accordance with
the instruction signal, and the rotator 30 rotates the projector 10
by a predetermined angle based on the rotation instruction. As a
result, a stereoscopic image or a planar image desired by the
viewer 40 is projected.
As illustrated in FIG. 5A, when an image 51 has a shape vertically
and horizontally symmetrical, even when the light guide plate 11 is
rotated from the state viewed as a stereoscopic image as
illustrated in FIG. 5B, the image 51 seems to remain unchanged in
its orientation as illustrated in FIG. 5C. In this manner, if the
image is vertically and horizontally symmetrical, even when the
light guide plate 11 is rotated, the viewer 40 views the image as a
stereoscopic image and a planar image in the same direction.
Therefore, it appears as if the image rises or retracts without
giving the impression of image change to the viewer 40, such as the
direction change of the image, and the movement gives a
presentation effect with more natural movement.
(Modifications of Shape of Projector)
Although the projector 10 in the first embodiment has been the
light guide plate 11 having a rectangular flat shape, the present
invention is not limited thereto, and the light guide plate 11
having various shapes can be used.
FIGS. 6A to 6C are schematic views showing modifications of the
light guide plate 11, and in a case of projecting as a stereoscopic
image, the light from the light source 20 is incident from the
position indicated by arrow C in either case. That is, FIGS. 6A to
6C illustrate a case when the light guide plate 11 is located at
the first position.
For example, as illustrated in FIG. 6A, the light guide plate may
be a light guide plate 11a having a square shape, but is not
limited to a rectangle or a square one, and may be flat plates of
various polygonal shapes. When being regular polygonal, the light
guide plate is rotationally symmetric. It is thus possible to make
the rotation of the light guide plate 11a hardly noticeable by
performing the rotation such that diagonals overlap each other even
before and after the rotation,
Further, as illustrated in FIG. 6B, the light guide plate may be a
light guide plate 11b having a circular flat plate shape. Being
circular, the light guide plate 11b always looks the same to the
viewer 40 when stopped at any rotation angle, and thus the rotation
of the light guide plate 11b is hardly noticed. By combining the
vertically and horizontally symmetric images with the light guide
plate 11b having a circular flat plate shape, it is possible to
switch a stereoscopic image and a planar image without causing the
viewer 40 to notice the rotation of the light guide plate 11b at
all, and to further improve the presentation effect. Since the
distance from the center of the circle, namely, the distance from
the rotating shaft is constant in the circular shape, the space
required for rotation is always constant irrespective of the
rotation angle, and the circular flat plate is also suitable for
installation in a case where the arrangement space is
restricted.
Further as illustrated in FIG. 6C, a light guide plate 11c may have
a curved main surface. Depending on a place to be installed and an
image to be displayed, it is also possible to selectively use the
light guide plate having the flat plate shape and the light guide
plate having the curved surface as described above.
Second Embodiment
A second embodiment will be described with reference to FIG. 7.
Descriptions of contents overlapping those in the first embodiment
will be omitted.
In the first embodiment, it is configured such that the base plate
31 of the rotator 30 is connected to the back surface 13 of the
light guide plate 11 and the light guide plate 11 is rotated. With
respect to a portion of the light guide plate 11 connected to the
base plate 31 as thus described, transmission of light from the
back surface is blocked by the base plate 31, and the translucency
of the light guide plate 11 is inferior.
A display device of the embodiment has a structure of a rotator
that does not block the back surface 13 of the light guide plate
11.
FIG. 7 is a schematic view illustrating the display device 1 of the
embodiment.
The light guide plate 11 in the embodiment has a circular flat
plate shape. The rotator 30 includes three rotating cylinders 34
and a rotation mechanism such as a motor (not illustrated) for
rotating the three rotating cylinders 34. The rotating cylinder 34
has an outer circumference formed of a highly adhesive member such
as rubber or urethane, and is disposed such that the outer
circumference is in close contact with the side surface of the
light guide plate 11. The three rotating cylinders 34 are evenly
arranged with respect to the light guide plate 11. In the rotation
mechanism for rotating the rotating cylinder 34, separate motors or
the like may be provided in the rotating cylinder 34, or the
rotational force of one motor may be transmitted to the three
rotating cylinders 34 by using a power transmission mechanism such
as a belt and a pulley which are known.
When the light guide plate 11 is rotated, the rotation mechanism is
driven to rotate the three rotating cylinders 34 in a direction of
arrow D. Since the rotating cylinder 34 rotates while being in
contact with the light guide plate 11, these rotational forces are
transmitted to the light guide plate 11, and the light guide plate
11 rotates with the rotation of the rotating cylinders 34.
In the embodiment, three rotating cylinders 34 have been provided
and the light guide plate 11 has been held at three positions.
However, the present invention is not limited thereto, and as long
as a structure is formed in which the light guide plate 11 is
stably held and rotated, the number of rotating cylinders may be
two or four, and is not limited.
The light source 20 in the embodiment is not joined to the light
guide plate 11 and is disposed at a position close to the side end
portion of the light guide plate 11. Light from the light emitting
unit (not illustrated) of the light source 20 is incident from the
side end of the light guide plate 11, the optical path of the light
is changed, and the light is emitted from the main surface as in
the first embodiment. The light source 20 is desirably disposed so
as to face the side end portion of the light guide plate 11.
With the light source 20 being not joined to the light guide plate
11, the light source 20 cannot follow the rotation of the light
guide plate 11. Therefore, in the embodiment, a plurality of light
sources 20 are provided. A first light source 20a is provided at a
position corresponding to the first position of the light guide
plate 11, where the image "A" is seen as a stereoscopic image. A
second light source 20b is disposed at a position corresponding to
the second position where the light guide plate 11 is rotated 90
degrees from the first position. Specifically, when the viewer 40
is to be caused to view a stereoscopic image, the light guide plate
11 is rotated so as to come to the first position, namely, a
position where an image "A" is indicated by a solid line, and light
is emitted from the first light source 20a. Next, when the viewer
40 is to be caused to view a planar image, the light guide plate 11
is rotated so as to come to the second position, namely, a position
where an image "A" is indicated by a dotted line, and light is
emitted from the second light source 20b. By providing the
plurality of light sources 20 as thus described, it is possible to
display a stereoscopic image and a planar image on the viewer 40
without causing the light source 20 to follow the light guide plate
11.
The switching between turning on and turning off of the first light
source 20a and the second light source 20b may be automatically
controlled based on the rotation amount of the rotator 30. The
switching may be controlled such that a sensor is provided in each
of the light sources 20a and 20b and each of the light sources 20a
and 20b is turned on at a timing when the sensor recognizes a mark
at the side edge of the light guide plate 11. The lighting timing
of the light source 20 may be controlled by any method as long as
the control is performed based on a known control method.
Note that the light source 20 may be joined to the end portion of
the back surface 13 of the light guide plate 11 to follow the
rotation of the light guide plate 11. In this case, irradiation
with light may be performed from the end portion of the back
surface 13, or irradiation with light may be performed from around
the side end of the light guide plate 11 by using a light guide
path such as an optical fiber from the light source 20. The light
guide path is suitably a light guide path with a relatively thin
and small structure which does not hinder the contact of the
rotating cylinder 34 and the transmission of rotational force.
As thus described, with the configuration of the embodiment, a
structure is formed in which nothing is joined to the back surface
13 of the light guide plate 11, particularly the central portion
thereof, so that an image can be displayed without impairing the
translucency at the center of the light guide plate 11. In
addition, by separately providing an image display device or the
like on the back surface 13 side of the light guide plate 11 and
arranging another image or video such as a background image,
variations in presentation that, for example, it is possible to
display a stereoscopic image "A" together with a background image,
increase.
Third Embodiment
A third embodiment will be described with reference to FIG. 8
Descriptions of contents overlapping those in the first embodiment
and the second embodiment will be omitted.
In the second embodiment, the structure has been formed in which
the rotating cylinder 34 is provided in close contact with the side
surface of the light guide plate 11, and the light guide plate 11
is rotated with the rotation of the rotating cylinder 34. The
rotating cylinder 34 has its outer circumference formed of a soft
material such as rubber or urethane and is easily brought into
close contact with the side surface of the light guide plate 11.
However, the rotating cylinder 34 deteriorates due to long-term use
and the adhesion to the light guide plate 11 may decrease. Also,
the rotating shaft of the rotating cylinder 34 may slightly distort
due to long-term use. When the degree of adhesion between the
rotating cylinder 34 and the light guide plate 11 changes due to
secular change of the rotating cylinder 34, the rotational force of
the rotating cylinder 34 may not be sufficiently transmitted to the
light guide plate 11, and the rotation amount of the light guide
plate 11 may become inaccurate. When the light guide plate 11 is
not accurately located in front of the first light source 20a and
the second light source 20b, the presentation effect of raising and
retracting of the image may somewhat deteriorate.
In the embodiment, as illustrated in FIG. 8, by urging the rotating
cylinder 34 toward the light guide plate 11 by an urging member 35
such as a spring, the degree of adhesion between the rotating
cylinder 34 and the light guide plate 11 is always kept
constant.
Specifically, a plurality of the urging members 35 are provided
corresponding to the respective rotating cylinders 34. The urging
member 35 is a coil spring, one end of which is fixed to a fixing
member such as an outer frame of the display device, and the other
end of which is in contact with the rotating cylinder 34. The
urging member 35 applies a pressing force to the rotating cylinder
34 in a direction to bring the rotating cylinder 34 into close
contact with the light guide plate 11. The pressing force has
strength such as extent as not to hinder the rotation of the
rotating cylinder 34.
By providing the urging member 35 in this manner, the rotating
cylinder 34 is always in contact with the light guide plate 11 with
a constant degree of adhesion, so that the light guide plate 11 can
be accurately rotated. Therefore, it is possible to accurately
display a stereoscopic image and a planar image to the viewer
40.
Fourth Embodiment
A fourth embodiment will be described with reference to FIG. 9.
Descriptions of contents overlapping those in the embodiments
described above will be omitted.
In the fourth embodiment, the rotating cylinder 34 and the light
guide plate 11 are brought into close contact with each other with
high accuracy by using the urging member 35, thereby ensuring the
rotation of the light guide plate 11. As described above, in the
rotation due to close contact between the rotating cylinder 34 and
the light guide plate 11, there is no unevenness on the rotation
surface, namely, the side surface of the light guide plate 11 and
the outer circumference of the rotating cylinder 34, so that smooth
rotation can be realized. On the other hand, since a structure
where the rotating cylinder 34 and the light guide plate 11 are
engaged with each other is not formed, it is not always possible to
pass all the rotation amount of the rotating cylinder 34 on to the
rotation amount of the light guide plate 11 by sliding or the like.
In particular, when the elasticity of rubber, urethane or the like
on the outer circumference of the rotating cylinder 34 deteriorates
due to long-term use, the rotating cylinder 34 may slip and a
slight idle state of the rotating cylinder 34 may occur. In the
embodiment, a rotating gear 36 is provided instead of the rotating
cylinder 34, and the rotational force of the rotating cylinder 34
is reliably transmitted to the light guide plate 11 by meshing of
the gear teeth.
As illustrated in FIG. 9, in the light guide plate 11 of the
embodiment, teeth 15 are formed on the side surface at regular
intervals. It is desirable that the teeth 15 be integrally formed
of the same material as the light guide plate 11. The rotator 30 is
provided with the rotating gear 36, a rotation mechanism such as a
rotating shaft and a motor (not illustrated) connected to the
rotating gear 36. The rotating gear 36 has a structure in which
teeth 361 formed on the outer circumference mesh with the teeth 15
of the light guide plate 11 and rotate the light guide plate 11 by
a predetermined amount with rotation of the rotating gear 36. The
number of the teeth 15 and the number of the teeth 361 may only be
set based on the interval of a known gear meshing structure and is
appropriately adjusted together with the diameter of the rotating
gear, the diameter of the light guide plate 11, and the like.
In the embodiment, the light guide plate 11 is held by the two
rotating gears 36, but the number of the rotating gears 36 is not
particularly limited, and may be appropriately provided at an
interval capable of efficiently holding the light guide plate
11.
As in the second embodiment, a plurality of light sources 20 may be
configured to be disposed at positions close to the end portion of
the light guide plate 11, or may be configured to be joined to the
back surface 13 of the light guide plate 11. Since the teeth 15 are
formed on the side surface of the light guide plate 11, a structure
is desirably formed in which light is incident from a position
avoiding the tip of the tooth 15 so that light is not scattered by
the tip of the tooth 15.
As thus described, since the light guide plate 11 is rotated by
meshing between the rotating gear 36 and the teeth 15 of the light
guide plate 11, the light guide plate 11 can be held without using
the urging member 35 or the like. In addition, since the teeth 361
of the rotating gear 36 mesh with each other and rotate, the teeth
361 are always engaged with the light guide plate 11, and the
rotating gear 36 does not idle. Therefore, the rotation of the
light guide plate 11 with a small amount of rotation can be
reliably controlled, and hence the rotation can be matched with the
light emission timing of the light source 20, thereby enabling more
highly accurate presentation.
In addition, the rotation mechanism for rotating the rotating gear
36 may be structured to be rotated with a hand instead of being
automatically rotated by the automatic operation of a motor or the
like. The hand-rotation structure may be a known power transmission
structure using a plurality of gears. By adopting the hand-rotation
structure in this manner, a stereoscopic image and a planar image
are switched by the hand-rotation speed of the viewer 40. Hence the
image jumps out or retracts at an unexpected timing by the
hand-rotation of the viewer 40, it is possible to perform new
presentation with irregularity not in automatic rotation.
Fifth Embodiment
A fifth embodiment will be described with reference to FIGS. 10A to
10C. Descriptions of contents overlapping those in the embodiments
described above will be omitted.
In the first embodiment, a description has been given of the light
source 20 being joined to the light guide plate 11 and moving
together with the light guide plate 11. In the second embodiment,
the mode has been described in which the two light sources 20 are
installed separately from the light guide plate 11 at the positions
close to the end portion of the light guide plate 11, the positions
respectively corresponding the first position where the image is
viewed as a stereoscopic image by the rotation of the light guide
plate 11 and the second position rotated 90 degrees from the first
position.
In the embodiment, a mode will be described in which the light
source 20 is not joined to the light guide plate 11, a plurality of
the light sources 20 are arranged close to each other, and light
can also be emitted between the first position and the second
position.
FIGS. 10A to 10C are schematic views each illustrating the
relationship between the light guide plate 11 and a light source 21
of the embodiment, where FIG. 10A is a schematic front view at the
first position where the image is viewed as a stereoscopic image,
FIG. 10B is a schematic perspective view illustrating the first
position where the image is viewed as a stereoscopic image, and
FIG. 10C is a schematic perspective view illustrating the second
position where the image is viewed as a planar image.
In a display device according to the embodiment, light sources 21b,
21c are arranged at equal intervals between a light source 21a
corresponding to the first position of the light guide plate 11 and
a light source 21d corresponding to the second position that is
rotated 90 degrees. The light sources 21a to 21d are not joined to
the light guide plate 11 but are provided in positions facing each
other in close to the side end portion of the light guide plate
11.
The light guide plate 11 has a circular flat plate shape, and an
image is formed at the center of the main surface 12. As shown in
the first embodiment, the rotator 30 has a shape in which the base
plate 31 and the shaft 32 are attached to the back surface 13.
The light sources 21a to 21d sequentially light up in accordance
with the rotation of the light guide plate 11 in the direction of
arrow E, and emit light to the side end of the light guide plate
11. As in the second embodiment, the turning on and turning off of
the light sources 21a to 21d may be controlled based on the
rotation amount of the rotator 30, or may be controlled by reading
the mark on the side end portion of the light guide plate 11 with
sensors (not illustrated) provided in the respective light sources
21a to 21d and using the reading. Since the plurality of light
sources 21a are provided, it appears to the viewer 40 that the
switching interval among the light sources 21a to 21d is short and
visually, continuous lighting is being performed. Note that the
number of the light sources 21 is not limited to four, but may be
appropriately set in accordance with the size of the light guide
plate 11 and the emission range of light from the light source
21.
As shown in the first embodiment, in the structure in which the
light source 20 is joined to the light guide plate 11 and rotated
together with the light guide plate 11, the number of the light
sources 20 may be small, but the wiring for supplying a signal and
electric power to the light source 20 also needs to be routed in
accordance with the rotation, and the space and the like for
routing the wiring have been necessary. Since the light source 21
in the embodiment does not move together with the light guide plate
11 but is fixed in the vicinity of the light guide plate 11, the
routing of the wiring in accordance with the rotation of the light
guide plate 11 is unnecessary. Although light sources 21 increase
in number but can be configured with a simple wiring structure.
Further, a plurality of light sources 21 are provided not only at
two places that are a place corresponding to the first position of
the light guide plate 11 and a position corresponding to the second
position, but also between the first position and the second
position. Thereby, a visually almost continuous lighting state is
held and a state is shown in which the orientation of the image
gradually changes, thus smoothly displaying the change from the
stereoscopic image to the planar image.
In the embodiment, the light guide plate 11 rotates in the
direction of arrow E in FIG. 10A, but the direction of rotation is
not limited thereto, and may be the opposite direction. Further,
the arrangement of the light sources 21 is not limited to the left
side, but may be on the right side or the like.
Sixth Embodiment
A sixth embodiment will be described with reference to FIGS. 11A to
11C. Descriptions of contents overlapping those in the embodiments
described above will be omitted.
In the embodiment, a case where the projector 10 has a cylindrical
shape will be described.
FIG. 11A is a schematic perspective view of a display device of the
embodiment, FIG. 11B is a sectional view obtained by cutting out
FIG. 11A along line XIb-XIb, and FIG. 11C is a schematic view of a
base plate 31a as seen from above.
The projector 10 is a transparent cylinder, and the bottom portion
thereof is joined to the rotator 30. A circular top surface that
faces the bottom portion is the light guide plate 11 having a
circular flat plate shape. The main surface 12 of the light guide
plate 11 is located on the outside of the cylinder and faces the
viewer 40. In addition, a light guide path 16 is formed on the
cylindrical side surface so as to connect from the light incident
position on the light guide plate 11 to the bottom surface of the
projector 10.
The rotator 30 includes the base plate 31, the shaft 32, and the
rotation mechanism 33 such as a motor. The base plate 31 has a
circular flat plate shape with a diameter such that the cylinder of
the projector 10 is placed with the diameter therewithin. In FIG.
11C, as indicated by a broken line along the circumference of the
base plate 31, the bottom portion of the projector 10, namely the
end of the cylindrical side surface, is in contact with the surface
of the base plate 31. The projector 10 is fixed to the base plate
31 by an engagement member 17. As in the first embodiment, the base
plate 31 rotates with the rotation of the rotation mechanism 33
around the shaft 32 located at the center as the rotating
shaft.
The place of the base plate 31 intersecting the light guide path 16
is open. The light source 20 is fixed to the back surface of the
base plate 31 just below a base plate opening 311. The light source
20 emits light toward the light guide path 16, the light from the
light source 20 passes through the base plate opening 311, and is
emitted to the light guide plate 11 via the light guide path 16.
The light guide plate 11 internally changes the optical path of the
incident light from the incident position and emits the light from
the main surface 12 to display an image.
Also, in the embodiment, the light source 20 emits light when
coming to the first position and the second position in accordance
with the rotation of the light guide plate 11, and displays an
image. When the light guide plate 11 is at the first position, the
image is viewed by the viewer 40 as a stereoscopic image. On the
other hand, when the light guide plate 11 is rotated 90 degrees and
is at the second position, the image is viewed as a planar
image.
Since the projector 10 has a cylindrical shape as described above,
a distance can be provided between the rotator 30 and the light
guide plate 11, namely the projection surface. The installation is
possible also in places where the rotator 30 cannot be directly
joined to the light guide plate 11 for reasons of the space for
installation, wiring, and the like. Further, since the rotator 30
is not directly attached to the back surface 13 of the light guide
plate 11, the translucency at the center of the light guide plate
11 is not impaired.
Further, since the cylindrical portion of the projector 10 is
transparent, by forming an image also on the cylindrical portion
and partially irradiating a place other than the light guide path
16 with light from the light source, it is possible to create new
presentation in combination between the image formed in the light
guide plate 11 and the image of the cylindrical portion.
Seventh Embodiment
A seventh embodiment will be described with reference to FIGS. 12A
to 12C. Descriptions of contents overlapping those in the
embodiments described above will be omitted.
In the seventh embodiment, it has been configured such that the
light source 20 is attached to the back surface of the base plate
31, and the light source 20 is moved together with the base plate
31. However, in the embodiment, a structure is formed in which a
plurality of the light sources 21a to 21d are arranged at
predetermined positions and do not move together with the light
guide plate 11.
FIG. 12A is a schematic perspective view illustrating a display
device of the embodiment, FIG. 12B is a sectional view obtained by
cutting out FIG. 12A along line XIIb-XIIb, and FIG. 12C is a
schematic view of a base 37 as seen from above.
As in the sixth embodiment, the projector 10 is a transparent
cylinder, and its top surface is the light guide plate 11. Light
from the light sources 21a to 21d is emitted to the light guide
plate 11 via the light guide path 16 provided on the cylindrical
side surface of the projector 10.
In the rotator 30 of the embodiment, the base 37 is placed on the
base plate 31, and only the base 37 rotates as the shaft 32
rotates, and the base plate 31 does not rotate. Specifically, the
base plate 31 has a base leg 31b, and is stood by the base leg 31b
at a place where the display device is installed. The base 37 is
placed on the base plate 31. The shaft 32 only passes through the
center of the base plate 31 and is not fixed to the base plate 31
but is fixed to the base 37 placed on the base plate 31. The
rotational force from the rotation mechanism 33 is transmitted only
to the base 37, not transmitted to the base plate 31, the base 37
rotates but the base plate 31 does not rotate.
In FIG. 12C, the projector 10 is fixed to the base 37, and as
indicated by a broken line along the circumference of the base
plate 31, the bottom portion of the projector 10, namely the end of
the cylindrical side surface, is in contact with the surface of the
base 37. As in the fixing method in the sixth embodiment, the
projector 10 is fixed by the engagement member 17. In the base 37,
a place intersecting the light guide path 16 of the projector 10 is
a base opening 371 which is open.
Four light sources 21 according to the embodiment are provided and
are joined to the back surface which is the back surface of the
surface of the base plate 31 on which the base 37 is placed. The
light sources 20b and 20c are arranged at equal intervals between
the light source 21a corresponding to the first position and the
light source 20d corresponding to the second position that is
rotated 90 degrees. Four openings, such as base plate openings 311a
to 311d, are opened above the respective light emitting units of
the light sources 21a to 21d in the base plate 31. That is, since
the base plate 31 does not rotate, the base plate openings 311a to
311d are provided in accordance with the light sources 21a to 21d
located on the back surface of the base plate 31.
Image projection is performed as follows. First, when the image is
shown to the viewer 40 as a stereoscopic image, the base opening
371 is located right above the light source 21a. The light from the
light source 21a passes through the base plate opening 311a,
further passes through the base opening 371 overlapping thereabove,
passes through the light guide path 16, is incident on the light
guide plate 11, and projects an image. Since the light guide plate
11 is located at the first position, the image is viewed as a
stereoscopic image by the viewer 40. Next, when, for example, the
base 37 rotates 90 degrees with the rotation of the rotator 30, the
base opening 371 is located on the light source 21d, and the light
from the light source 21d passes through the light guide path 16
and is incident on the light guide plate 11 to project an image. As
the base 37 rotates, the light guide plate 11 is located at the
second position, so that the image is viewed as a planar image by
the viewer 40. Note that not only such a type is used in which the
light source 21 is turned on only when the light guide plate 11 is
located at the first position and the second position, but as in
the fifth embodiment, such a type may be used that four light
sources of the light source 21a to the light source 21d are
sequentially turned on with the movement of the base 37. This is a
mechanism in which, when the base opening 371 is located above the
light sources 21a to 21d, the light sources 21a to 21d emit
light.
The base 37 rotates and the base plate 31 and the light source 21
do not rotate as thus described, thereby simplifying the wiring
routing structure of the light source 21. Since the four light
sources 21 are switched at short intervals in accordance with the
movement of the projector 10 as in the fifth embodiment, in a state
where the lighting state substantially visually continuous is held
and the orientation of the image gradually changes, the change from
a stereoscopic image to the planar image is displayed more
smoothly.
The present invention is not limited to the embodiments described
above, but can be subjected to a variety of changes in the scope
shown in the claims. An embodiment obtained by appropriately
combining technical units disclosed respectively in different
embodiments is also included in a technical scope of the present
invention.
While the invention has been described with respect to a limited
number of embodiments, those skilled in the art, having benefit of
this disclosure, will appreciate that other embodiments can be
devised which do not depart from the scope of the invention as
disclosed herein. Accordingly, the scope of the invention should be
limited only by the attached claims.
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